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Method for measuring diameter and straightness accuracy parameters of seamless round steel pipe

The invention relates to a method for measuring the diameter and the straightness accuracy parameters of a seamless round steel pipe. The method includes the steps as follows: accomplishing the calibration of parameters of a multi-linear structured light vision sensor formed by one video camera and multi-line laser projectors; distributing the multi-linear structured light vision sensors on the periphery of the seamless round steel pipe to be tested; respectively controlling the laser projectors to project structured light plane onto the measured section of the seamless round steel pipe by a computer, collecting the images of laser stripes on the surface of the seamless round steel pipe and processing the images of the laser strip by a video camera, and calculating the three-dimensional coordinates of different sections according to a measurement model; determining the elliptical center of each section of the space, realizing the measurement of the straightness accuracy of the seamless round steel pipe and establishing the dynamic and virtual central axis of the seamless round steel pipe; establishing the reference plane of the dynamic and virtual projection of ellipse of the section of the space; and front projecting the ellipse of the section of the space onto the reference plane of the dynamic and virtual projection, and carrying out the operation of circle fitting on the reference plane, thereby obtaining the section circle of the steel pipe. The method can realize the on-line, real-time, automatic and noncontact measurement of the diameter and the straightness accuracy parameters of the seamless round steel pipe.
Owner:TIANJIN UNIV

Method for creating three-dimensional model by using sketch

InactiveCN101799937AImprove naturalness and freedomImprove versatility3D modellingEngineeringTheoretical computer science
The invention discloses a method for creating a three-dimensional model by using a sketch, which comprises the following steps of: dividing strokes of a freehand sketch into primitive strokes functioning as the outline of an object and threaded strokes acting as three-dimensional effect, identifying the strokes respectively and regularizing the primitive strokes; indicating the geometric constitution of the object by using a conditional rule generation method and realizing rule-driven reasoning by using primitive adjacency relationship under the guidance of drawing threads so as to identify object units and recover the depth information of each object unit; automatically discriminating and completing hidden lines of the object units according to geometric attributes of the object units under the guidance of a drawing thread rule so as to generate a complete three-dimensional object unit; and recreating the three-dimensional model of the object by using a geometric splicing method according to topological relation among the object units. The method has the advantages of expressing the three-dimensional effect with auxiliary threads, such as shade lines and the like, and drawing the perspective projection outline of the object with the freehand sketch so as to improve the degree of freedom of drawing.
Owner:NANJING UNIV
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